Once I opened the box I knew immediately they sent me the wrong computer

I also contacted Amazon.com because I feared that by the time I received the new computer, the 1 month time period that I had to return it to Amazon would have expired

Unit arrived with dead computer and missing safety key.

No complex computer stuff just on / off

As another reviewer pointed out the speed adjustments speed up for a few seconds when slowing down which can make you trip or startle u since it jerks you into an unexpected speed.